Originally sold in 2001 by Apple Inc. as a portable music player exclusively for Macintosh’s operating system, the iPod’s market share began to grow as it included Windows operability in 2002 and introduced its iTunes Store in 2003. In June of 2004 this fourth generation iPod was announced, notably adopting the “Click Wheel” controls from the iPod mini and vaulting the iPod to a 90 percent share of the portable music player market. The 4th generation iPod priced the 20GB version at $299 and the 40 GB model for $399.